APP Configuration

Steps:

- Create Forward Lookup Zone- Domain Name and Cnamne in DNS for app domain
- Verify Domain name and ping in netwrok.
-  Enable Microsoft SharePoint Foundation Subscription setting services, App management services
- Navigate to App settings & configure app URL

Refer:
http://www.enjoysharepoint.com/Articles/Details/configure-app-environment-and-create-a-app-in-sharepoint-server-2013-21894.aspx

Office 365 Business Plans

Microsoft Offering -SaaS- Office365 comes up with different subscription associated with each subscription set of features.

Naming few are E1,E3,O365 Proplus, E5 plan deatiled of this subscription can be referred in below link provided.

https://products.office.com/en-in/business/compare-more-office-365-for-business-plans